First i'll tell you what pre-monsoon showers are-

rain that happens before the monsoon season are called pre-monsoon showers.

1. You are sitting in your balcony and suddenly it starts raining on june 30/31

2. well, you're enjoying the lovely sunny weather and it starts to drizzle (rain lightly) it gets a little heavy but then it starts suddenly.

hope it helped
Pre monsoon showers are those rain showers that fall just before monsoon season. In India 2 examples of pre monsoon showers are MANGO SHOWERS and KALBAISAKHI showers
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